evenPrimes is package{
  isEvenAndPrime has type (integer) => boolean;
  isEvenAndPrime(2) is true;
  isEvenAndPrime(_) default is false;

  isEvenAndPrime3 has type boolean;
  isEvenAndPrime3 is isEvenAndPrime(3);
  
  main() do {
    logMsg(info,"$isEvenAndPrime3");
    assert not isEvenAndPrime3;
  }
}